su worked when sudo did not. Thank you very much. Sound (both YouTube.com and Great Little Radio Player) now works. Two questions:

1. Since I prefer to run always fresh, is there a way I do not need to do this every time? Maybe write some kind of script? But if I put it in my KDE System Settings > Startup and Shutdown > Autostart, it will not survive the re-boot as I am Always Fresh, right?
2. I assume asound.conf contains my sound configuration, but what do these settings do?
defaults.pcm.card 1
defaults.ctl.card 1

I used your command above to copy /etc/asound.conf to my USB (/mnt/sdb1/), and was able to test without even having to edit /mnt/sdb1/boot/syslinux/porteus.cfg on my USB, because you taught me the tab trick. I simply hit tab at the mode selection, removed the changes=/porteus parameter, and I heard the Porteus KDE Workspace login sound, and am listening to the Great Little Radio Player.